Magneto



vE. A. NEW.

MAGNfTo.

APPLICA-[10N mo Nov. 28, |919. 1,379,41 3. y

Patented May 24,1921.

2 SHEETS-SHEET l.

E. A). NEW.l

MAGNETO.

APPLICATIDN HLED Nov.2s, 1919.

Patented May 24, 1921.

2 SHEETS- SHEET 2.

/A/ VENIUR dMd/d /Yew.

ATOHNEYS UNITED STATES PATENT-OFFICE.

EDWARD ALBERT NEW, OF GREAT BARRINGTON, IVIASSACI'U'SETTS, ASSIGNOR T0 WILLIAM W. NICOLL, OF NEW YORK, N. Y.

MAGNETO.

Specicaton of Letters Patent.

Patented May 24, 1921.

Application led November 28, 1919. Serial No. 341,108.

T 0` all whom t may concern.

Be it known that I, EDWARD A. NEW, a citizen of the United States, and a resident of Great Barrington, in the county of Berkshire and State of Massachusetts, have invented anew and Improved Magneto, of which the following is a full, clear, and exact description.

This invention relates to improvements in magnetos, and more particularly to hand operated magnetos designed to discharge a uniform current at each operation and which is particularly adapted for use in blasting operations.

A further object is to provide a magneto which is operated by a spring and provide improved means for winding the spring to store energy therein and which winding means are disconnected when the spring has been given a predetermined movement.

A further object is to provide a magneto with an improved arrangement of cams controlling the release of an operating handle so that when the handle has been turned a predetermined distance, it is released or disconnected.

A further object is to provide a magneto which discharges a uniform current at each operation regardless of the strength or speed of operation of the handle storing energy in the operating spring.

With these and other objects in view the invention consists in certain novel features of construction, and combinations and arrangements of parts, as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings Figure 1 is a view in section illustrating my improvements;

Fig. 2 is a view in section on the line 2 2 of Fig. 1;

Fig. 3 is a view in section on the line 3 3 of Fig. 1;

Fig. 4 is a viewin section on the line 4 4 of Fig. 1;

Fig. 5 is an end elevation of the guide sleeve 19; v

Fig. 6 is a view in section through the sleeve; and l Fig. 7 is a fragmentary perspective view of the coupling end of the handle.

1 represents a casing having a cover 2 and inclosing a magneto 3. 4 represents the drive shaft of the magneto and 5 is an op erating shaft adapted to be turned by means of a handle 6. A countershaft 7 is located between the shafts 4 and 5 and motion is transmitted from the shaft 5 to the shaft 7 by means of gears 8 and 9 and from the shaft 7 to the shaft 4 by means of gears 10 and 11 respectively. These gears are of the proper size to multiply the movement of shaft 5 to the desired extent.

The shaft 4 is connecte-d by a ratchet clutch 12 with its barrel 13 so that the shaft can turn independently in one direction and will turn with the barrel in the other direction. A spring 14 is positioned around the shaft 5, is secured at one end to the shaft and at its other end to a block 15 so that the spring tends to turn the shaft 5 in one direction and is wound by turning the shaft in the opposite direction. v A segmental contact 16 is secured to turn with the gear wheel 8 and is adapted at one position of the gear wheel to electrically connect a pair of brushes 17 and 18 of the magneto, but during most of the turning movement of the gear wheel is moved away from one of the brushes so that the electric circuit is open except as the gear wheel reaches the end of its movement in one direction to permit the discharge of the electric current generated by the magneto.y

My invention is not limited to any particular construction and arrangement of parts for generating current as I might utilize any arrangements of devices for this purpose. On the other hand, my invention resides more particularly in the means for controlling the operation of the magneto which consists in a novel connection between the handle 6 andthe' shaft 5, as will now be explained. c

-A guide sleeve 19 is fixed to the cover 2 and the upper end of shaft 5 projects into this guide sleeve and is provided with a transverse pin 20. The handle 6 may be of any desired form but is preferably` of the general T-shape shown with the post thereof tubular in form to receive the upper end of shaft 5. A collar 21 is fixed to the handle 6 and is provided with a cam 22 which rides upon a cam shoulder 23 in the sleeve 19 so that when the handle 6 is turned in one direction, it is caused to move longitudinally by reason of the cam surfaces 22 and 23 to cause the release of the pin 2O from notches 24 in the end of the handle. In other words,

when the handle is inserted over the shaft 5, the projecting ends of the pin 2O are received in the notches 2 4 so that the turning movement of the handle is imparted to the shaft until the cam surfaces 22 and 28 cause the handle to move longitudinally releasing the pin from the notches 24.

The manual operation of the handle to turn it in one direction operates to wind the spring 14 storing energy therein. TVVhen the cam 22 causes the handle to be released from the shaft, the spring 14, through the medium of the gears S, 9, 10 and 11, imparts a rotary movement to the shaft 5 to discharge an electric current from the magneto. As this discharge is always caused by the return movement of the spring, it is always uniform regardless of the speed of the turning movement of the handle to store energy in the spring.

To limit the turning movement of the shaft, ahead 25 is fixed thereto and provided with a lug 26 which engages a shoulder 27 on the frame of the magneto so that the magneto is operated uniformly by each uncoiling operation of the Spring 14. Should the spring 14 break, there would be no discharge of current and hence, only a uniform discharge of current can be had at all times.

A flexible handle 28 is connected at one end to the cover 2 and at its other end is provided with an internally screw threaded cap 29 which is adapted to screw over the threaded outer end of the sleeve 19 when the handle 6 is removed, and this handle 28 is referably composed of a fiexible tube 30 lnclosing a chain 31, as clearly indicated in Fig. 1.

During the operation of winding the spring 14, the contact 16, above referred to, is moved so as to open the electric circuit and maintain the circuit open until the gear wheel 8 nears the end of its return movement when, for an instant, the contact 16 engages both of the brushes 17 and 18 and closes the circuit allowing the discharge of current.

It is obvious that the ,parts may be so arranged as to permit the turning Vmovement of the shaft 5 either to the left or to the right as mayk be desired, merely requiring a reversal of the arrangement of parts as indica-ted. l

As above stated, my invention resides more particularly in the mechanical and automatically operating control for insuring a uniform discharge of current from the magneto rather than in the details of construction of the magneto itself and hence, I do not wish to be limited to the particular form of magneto shown.

Various slight changes may be made in the general form and arrangement of parts describedk without departing from the invention, and h-ence I do not limit myself to the precise details `set forth but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

I claim:

1. The combination with a magneto, a spring operating the magneto, and a shaft for winding the spring, of a handle adapted to turn the shaft, and a cam compelling longitudinal movement of the handle to release the same from the shaft when the latter reaches a predetermined position.

2. The combination with a magneto, a. spring operating the magneto, a shaft for winding the spring, said shaft having a crossed pin at one end, and means limiting the turning movement of the shaft, of a sleeve into which the shaft projects, a tubular handle having notched ends receiving the pin, and cam faces on the handle and the sleeve compelling the release of the handle from the shaft when the latter reaches a'predetermined position.

3. The combination with a magneto, and

a spring operating the magneto, of a shaft for winding the spring, contact devices permitting closing of the circuit from the magneto during a portion only of the movement of the shaft, a handle for operating the shaft, and automatic means releasing. the handle from theV shaft when the latter reaches a predetermined position.v

4. In a magneto, the combination with a casing, a shaft controlling the operation of the magneto and extending through the casing, an externally screw threaded guide sleeve on the casing into which the shaft projects, a handle adapted to couple with the shaft, means for releasing the handle from the shaft when the latter reaches a predetermined position, a flexible handle connected at one end to the casing top, and a screw threaded cap on the other end of said iexible handle adapted to engage the sleeve when the first-mentioned handle is removed. Y

5. The combination `with a magneto, a spring operating the magneto,and a shaft for winding the spring, of a pair of contacts included in circuit with the magneto, alcontact movable with the shaft andv electrically connecting said contacts during a portion'only ofthe movement of the shaft, a handle for operating the shaft, and means compelling the release of the handle from the shaft when the latter reaches a predetermined position.

EDWARD ALBERT New. 

